/*
 * Copyright 2022 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.test.netty.util;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.SelfSignedCertificate;
import io.netty.util.CharsetUtil;

import javax.net.ssl.SSLException;
import java.io.ByteArrayInputStream;
import java.security.cert.CertificateException;
import java.util.ArrayList;
import java.util.List;

/**
 * Some useful methods for server side.
 */
public final class ServerUtil {

    private static final boolean SSL = System.getProperty("ssl") != null;

    private ServerUtil() {
    }

    public static SslContext buildSslContext() throws CertificateException, SSLException {
        if (!SSL) {
            return null;
        }
        SelfSignedCertificate ssc = new SelfSignedCertificate();
        return SslContextBuilder
                .forServer(ssc.certificate(), ssc.privateKey())
                .build();
    }

    public static void main(String[] args) {
        //ByteBuf content = Unpooled.copiedBuffer("hello, 我是服务器", CharsetUtil.UTF_8);
         Integer test = 0X1;
         "sss".getBytes();
        System.out.println(hexStringToByteArray("BABE").length);

        System.out.println(Integer.parseInt("BABE",16));

        System.out.println(bytesArrayToHexString(hexStringToByteArray("BABE")));

    }

    public static byte[] hexStringToByteArray(String str) {
        int len = str.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(str.charAt(i), 16) << 4)
                    + Character.digit(str.charAt(i + 1), 16));
        }
        return data;
    }

    public static String bytesArrayToHexString(byte[] src) {
        StringBuilder stringBuilder = new StringBuilder();
        if (src == null || src.length <= 0) {
            return null;
        }
        for (byte b : src) {
            int v = b & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }
}
